Statistics – Computation
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..607c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 607-621.
Statistics
Computation
4
Astronomical Photometry, Cosmology, Density (Number/Volume), Galactic Clusters, Morphology, Red Shift, Computational Astrophysics, Galactic Evolution, Mass To Light Ratios, Perturbation Theory
Scientific paper
The morphological properties of the rich supercluster 1451 + 22 are investigated using photographic galaxy photometry in a two-color system especially sensitive to redshift. By measuring about 125,000 galaxies in five Palomar Schmidt fields, the supercluster's shape, density profile, density contrast, and galaxy population are found. The data suggest that the structure of 1451 + 22 is that of a face-on pancake, flattened against the plane of the sky, although spherical models are not ruled out. Filaments which are rich in early-type galaxies do exist, but most of the supercluster mass lies outside these regions. In addition, 1451 + 22 may have a core-halo structure, with the central degree containing a much higher galaxy density and a larger percentage of elliptical and SO galaxies than the outer regions. If 1451 + 22 is flat, the mean luminosity density contrast of the supercluster over the field is rho/rho(field) about 10, and the total mass of the system is probably greater than 10 to the 16th solar masses. If the supercluster is quasi-spherical, the observed density contrast is rho/rho(field) about 5, implying a total mass-to-light for the supercluster of about 130, and a cosmological density parameter of about 0.3.
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